{
  - address: {city=New York, zipcode=10001}
  + address: {city=New York, zipcode=10002}
  - age: 30
  + age: 31
  + car: null
    name: John
  - pets: [{type=dog, name=Buddy}, {type=cat, name=Whiskers}]
  + pets: [{type=dog, name=Bobby}, {type=cat, name=Fluffy}]
}
